Article
Nanoscience & Nanotechnology
Xuanyi Zhang, Aubrey N. Penn, Lena Wysocki, Zhan Zhang, Paul H. M. van Loosdrecht, Lior Kornblum, James M. LeBeau, Ionela Lindfors-Vrejoiu, Divine P. Kumah
Summary: The temperature-dependent layer-resolved structure of SrRuO3 films grown on Nb-doped SrTiO3 substrates is investigated using high-resolution techniques, revealing the importance of structural distortions in suppressing ferromagnetism in ultra-thin films. The orthorhombic distortions are found to be strongly dependent on temperature, film thickness, and distance from the film-substrate interface, with structural coupling effects observed in interfacial layers.
Article
Chemistry, Physical
K. Kudo, S. Yamada, M. Yafuso, T. Kimura, V. K. Lazarov, K. Hamaya
Summary: Experimentally, it was shown that Co2MnSi films grown at low temperatures exhibit half-metallic properties, high spin polarization, and negative anisotropic magnetoresistance; this study will contribute to the development of novel spintronic applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
Iciar Arnay, Aida Serrano, Veronica Braza, Rosalia Cid, Ana M. Sanchez, Jsus Lopez-Sanchez, German R. Castro, Juan Rubio-Zuazo
Summary: This paper reports on the growth of epitaxial Fe3Si ultra-thin films by pulsed laser deposition on SrTiO3(001) substrates and analyzes the effect of deposition temperature on the structural, morphological, and magnetic properties of the films. The results show that the best magnetic response is achieved at 200°C, which represents the optimal compromise between phase purity and interface quality.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Multidisciplinary
Yogesh Sharma, Binod Paudel, Amanda Huon, Matthew M. Schneider, Pinku Roy, Zachary Corey, Rico Schonemann, Andrew C. Jones, Marcelo Jaime, Dmitry A. Yarotski, Timothy Charlton, Michael R. Fitzsimmons, Quanxi Jia, Michael T. Pettes, Ping Yang, Aiping Chen
Summary: This study investigates the relationship between strain engineering, point defects, and ferromagnetism in actinide epitaxial thin films, and provides new insights into the influence of coupled order parameters on the emergent properties of actinide materials.
Article
Physics, Applied
I. Ahmed, S. De Gendt, C. Merckling
Summary: The BaBiO3 perovskite oxide is an interesting material system that exhibits superconductivity when p-doped and predicted topological insulation when n-doped. High-quality single crystalline BaBiO3 films are grown on Si(001) substrates using molecular beam epitaxy, with the growth window established by systematically varying growth parameters.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Chemistry, Physical
Moloud Kaviani, Ulrich Aschauer
Summary: Complex oxide functionality, such as ferroelectricity, magnetism or superconductivity, is often achieved in epitaxial thin-film geometries. However, the stability and electronic structure of oxygen vacancies, which are the dominant type of defect in these materials, have been primarily studied in bulk or strained bulk, neglecting the interfaces and surfaces present in thin-film geometries. In this study, density functional theory calculations were used to investigate oxygen vacancies in a SrMnO3 thin film grown on a SrTiO3 substrate. The results show that surface and interface effects lead to significant differences in the stability and electronic structure of oxygen vacancies in thin-film geometries compared to the (strained) bulk.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Physics, Applied
T. Kawagoe, S. Suga
Summary: The growth of thin Pd films on Au(001) surfaces has been investigated. The films were found to grow epitaxially with noticeable lattice expansion on the Au(001) surface, and annealing improves the surface morphology. This three-step method enables quasi-layer-by-layer growth.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Chemistry, Multidisciplinary
Joao Otavio Mendes, Andrea Merenda, Karen Wilson, Adam Fraser Lee, Enrico Della Gaspera, Joel van Embden
Summary: The growth of (001) oriented antimony chalcogenide thin films can be controlled by tuning the substrate nanostructure, which is crucial for enhancing the performance of these films.
Article
Physics, Condensed Matter
Bin Cheng, Xing Liu, Jifan Hu
Summary: The advanced interface of Fe3O4/SrTiO3 has received attention and experiments have provided controversial results. We propose a theoretical model that explains the structure at the interface and predicts its magnetic properties.
MICRO AND NANOSTRUCTURES
(2022)
Article
Nanoscience & Nanotechnology
Chuanbin Wang, Shihang Liu, Junwei Shi, Qiang Shen
Summary: In this study, NiFe2O4 films were successfully deposited on BCZT-buffered SrTiO3 substrate by pulsed laser deposition, and it was found that the thickness of the buffer layer significantly influenced the rearrangement of cations and magnetic properties of NiFe2O4 films.
Article
Physics, Multidisciplinary
Haimin Zhang, Dezhi Song, Fuyang Huang, Jun Zhang, Ye-Ping Jiang
Summary: We investigated the growth kinetics of ultra-thin tellurium (Te) films on SrTiO3 (STO) (001) using molecular beam epitaxy (MBE) and scanning tunneling microscopy/spectroscopy. By driving the growth kinetics to the extreme condition, we achieved the growth of ultra-thin beta-Te films with near-complete coverages. Our work establishes the necessary conditions for the growth of ultra-thin materials with similar kinetics and thermodynamics.
Article
Chemistry, Physical
A. Crespo, J. Gallenberger, M. De Santis, V. Langlais, F. Carla, J. M. Caicedo, J. Rius, X. Torrelles
Summary: The epitaxial growth and properties of anatase films deposited on SrTiO3 single crystals have been studied. The strain evolution, lattice parameters, and annealing effects were investigated. Pulsed laser deposition films grew into square islands that aligned with the substrate lattice directions. Film annealing melted the islands into flat terraces, with larger terraces achieved at higher temperatures. The growth process allowed control of surface terrace size and stoichiometry, making these films suitable for various applications.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Jonathan R. Chin, Marshall B. Frye, Derrick Shao-Heng Liu, Maria Hilse, Ian C. Graham, Jeffrey Shallenberger, Ke Wang, Roman Engel-Herbert, Mengyi Wang, Yun Kyung Shin, Nadire Nayir, Adri C. T. van Duin, Lauren M. Garten
Summary: Self-limiting stoichiometry promotes the growth of SnSe thin films by maintaining film stoichiometry and controlling crystallographic orientation. Results show that self-limiting stoichiometry can increase the lateral scale of SnSe layers, providing a promising avenue for device fabrication.
Article
Materials Science, Multidisciplinary
Jie Lu, Zi Wang, Di Xue, Ming Chu, Yingying Zhang, Lianlian Ji, Qi Wang, Xingyu Jiang, Yinghui Sun, Qian Miao, Bin Dong, Lizhen Huang, Lifeng Chi
Summary: In this study, a heteroepitaxy strategy was reported to fabricate highly aligned organic crystalline thin films with high charge mobility and air stability. The structured films showed excellent performance in UV light and gas detection.
ACS MATERIALS LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Jie Lu, Zi Wang, Di Xue, Ming Chu, Yingying Zhang, Lianlian Ji, Qi Wang, Xingyu Jiang, Yinghui Sun, Qian Miao, Bin Dong, Lizhen Huang, Lifeng Chi
Summary: An epitaxy strategy was reported for fabricating highly aligned organic crystalline thin films with high charge mobility and responsive surfaces/interfaces.
ACS MATERIALS LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Wendel S. Paz, Marcos G. Menezes, Nathanael N. Batista, Gabriel Sanchez-Santolino, Matej Velicky, Maria Varela, Rodrigo B. Capaz, Juan Jose Palacios
Summary: Franckeite is a natural superlattice composed of two alternating layers of different composition, which has potential for optoelectronic applications. Its layered nature allows for easy exfoliation into thin heterostructures. The complex chemical composition and lattice structure of franckeite have made it challenging to screen for materials with nontrivial topological properties. Density functional theory calculations predict a quantum phase transition originating from stoichiometric changes in one of franckeite's layers.
Article
Chemistry, Multidisciplinary
Daniel del-Pozo-Bueno, Maria Varela, Marta Estrader, Alberto Lopez-Ortega, Alejandro G. Roca, Josep Nogues, Francesca Peiro, Sonia Estrade
Summary: The study investigates the local magnetization of antiferromagnetic/ferrimagnetic FeO/Fe3O4 core/shell nanocubes using electron magnetic circular dichroism (EMCD), revealing a concentric structure with four different magnetic zones. The EELS compositional analysis shows an oxidation gradient at the interface between the FeO core and Fe3O4 shell. The magnetic moment is largest at the surface and decreases toward the core, indicating a correlation between the inner magnetic structure and the microstructure of the nanoparticles.
Article
Nanoscience & Nanotechnology
Tingfeng Song, Saul Estandia, Huan Tan, Nico Dix, Jaume Gazquez, Ignasi Fina, Florencio Sanchez
Summary: The endurance of ferroelectric HfO2 needs to be enhanced for its commercial application. This study shows that fatigue in epitaxial Hf0.5Zr0.5O2 films can be mitigated by increasing the amount of paraelectric phase. Conversely, films almost free of parasitic monoclinic phase exhibit severe fatigue, indicating that fatigue can be inherently pronounced in ferroelectric HfO2.
ADVANCED ELECTRONIC MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Tingfeng Song, Huan Tan, Saul Estandia, Jaume Gazquez, Marti Gich, Nico Dix, Ignasi Fina, Florencio Sanchez
Summary: The metastable orthorhombic phase of HZO can be stabilized on LSMO/STO(110), resulting in improved ferroelectric properties and higher endurance.
Article
Nanoscience & Nanotechnology
Jan Grzelak, Jaume Gazquez, Alba Grayston, Mariana Teles, Fernando Herranz, Nerea Roher, Anna Rosell, Anna Roig, Marti Gich
Summary: Multifunctional magnetic nanocomposites based on mesoporous silica have a wide range of potential applications in various fields. By controlling the structure, nanoparticles with different shapes can be prepared to respond to external magnetic fields. The application of these nanoparticles in biomedicine is particularly promising, but research on nanorods is currently limited.
ACS APPLIED NANO MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Xiao Long, Huan Tan, Saul Estandia, Jaume Gazquez, Florencio Sanchez, Ignasi Fina, Josep Fontcuberta
Summary: The electroresistance yield and endurance of ultrathin Hf0.5Zr0.5O2 (HZO) films can be improved by using a 1 nm SrTiO3 capping layer, reducing charge transport along grain boundaries. This strategy can be explored in polycrystalline films.
Article
Chemistry, Multidisciplinary
Stefan Marinkovic, Alejandro Fernandez-Rodriguez, Emile Fourneau, Mariona Cabero, Hailin Wang, Ngoc Duy Nguyen, Jaume Gazquez, Narcis Mestres, Anna Palau, Alejandro Silhanek
Summary: Simultaneous optical microscopy and electric transport measurements on La0.7Sr0.3MnO3 nanobridges grown on SrTiO3 (STO) provide direct evidence of directional oxygen vacancy migration under large voltage bias. Comparative study on structures with applied voltages across a micron-scale gap reveals that high electric fields induce electrolytic modifications confined to the anode. Extensive electromigration results in the formation of linear surface scars on the STO substrate, attributed to thermal rather than electrical origin, and correlated with the proliferation of edge dislocations and local lattice expansion.
ADVANCED MATERIALS INTERFACES
(2022)
Article
Physics, Applied
Yunwei Sheng, Mathieu Mirjolet, Mario Villa, Jaume Gazquez, Jose Santiso, Andreas Klein, Jordi Fraxedas, Josep Fontcuberta
Summary: Epitaxial LaFeO3-based photocells with different thicknesses were grown on LSAT single-crystal substrates, using LSMO and Pt/BLSO electrodes, to determine their photoresponse. The short-circuit photocurrent initially increases and then decreases with LFO thickness, and is larger or smaller with Pt or BLSO electrodes. The open-circuit voltage shows the opposite trend, being smaller or larger with Pt and BLSO, respectively, consistent with the electronic band alignments and rectifying character of the dark current-voltage data. The complex microstructure and grain boundaries of the films play a significant role in the observed responsivity, which is larger than in similar LFO-based structures.
PHYSICAL REVIEW APPLIED
(2023)
Article
Materials Science, Multidisciplinary
Tingfeng Song, Huan Tan, Anne-Claire Robert, Saul Estandia, Jaume Gazquez, Florencio Sanchez, Ignasi Fina
Summary: Chemical doping and epitaxial stress can synergistically tailor the ferroelectric properties of HfO2 films, potentially leading to improvements in performance.
APPLIED MATERIALS TODAY
(2022)
Article
Chemistry, Inorganic & Nuclear
Jhonatan R. Guarin, Carlos Frontera, Judith Oro-Sole, Jaume Gazquez, Clemens Ritter, Josep Fontcuberta, Amparo Fuertes
Summary: Europium tantalum perovskite oxynitrides were successfully prepared by a new high-temperature solid-state synthesis method. The crystal structure and magnetic properties of the materials can be tuned by different reactant mixtures and gas atmospheres. Among them, Eu3Ta3O3.66N5.34 is the first example of a triple perovskite oxynitride.
INORGANIC CHEMISTRY
(2023)
Article
Chemistry, Inorganic & Nuclear
Jon Serrano-Sevillano, Judith Oro-Sole, Jaume Gazquez, Carlos Frontera, Ashley P. Black, Montse Casas-Cabanas, M. Rosa Palacin
Summary: This study focuses on the analysis of structural defects in Ca4Fe9O17, confirming their presence using various techniques and software, and discussing the impact of these defects on the properties of the material.
INORGANIC CHEMISTRY FRONTIERS
(2022)
Article
Materials Science, Multidisciplinary
Tingfeng Song, Saul Estandia, Nico Dix, Jaume Gazquez, Marti Gich, Ignasi Fina, Florencio Sanchez
Summary: This study explores the properties of ferroelectric HfO2 films grown on La0.67Sr0.33MnO3/SrTiO3(001) and SrTiO3(111) substrates. The results show that the orthorhombic phase can be stabilized by tilted epitaxy, and the orientation of orthorhombic crystallites in the film is different from that of the substrate. The measured results demonstrate a high remanent polarization, as well as good endurance and retention.
JOURNAL OF MATERIALS CHEMISTRY C
(2022)
Article
Engineering, Electrical & Electronic
Milena Cervo Sulzbach, Huan Tan, Saul Estandia, Jaume Gazquez, Florencio Sanchez, Ignasi Fina, Josep Fontcuberta
Summary: Researchers have found that ferroelectric and resistive switching behavior can be observed in 2 nm thick epitaxial Hf0.5Zr0.5O2 (HZO) tunnel junctions. These devices exhibit memristive and spike-timing-dependent plasticity behavior, with good retention.
ACS APPLIED ELECTRONIC MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Andres Gomez, Jose Manuel Vila-Fungueirino, Claire Jolly, Ricardo Garcia-Bermejo, Judith Oro-Sole, Etienne Ferain, Narcis Mestres, Cesar Magen, Jaume Gazquez, Juan Rodriguez-Carvajal, Adrian Carretero-Genevrier
Summary: This study focuses on the chemical synthesis of a novel SMO hollandite-type manganese oxide nanowire thin film on silicon, revealing its unique crystal structure and ferroelectric and piezoelectric properties. The material shows excellent deformability and high interface recombination, indicating the possibility of engineering the integration of ferroelectric oxides on silicon.
Article
Materials Science, Multidisciplinary
Saul Estandia, Jaume Gazquez, Maria Varela, Nico Dix, Mengdi Qian, Raul Solanas, Ignasi Fina, Florencio Sanchez
Summary: Epitaxial orthorhombic Hf0.5Zr0.5O2 (HZO) films on La0.67Sr0.33MnO3 (LSMO) electrodes exhibit robust ferroelectricity with high polarization, endurance, and retention. However, similar results have not been achieved on other perovskite electrodes. The critical effect of the electrode on the stabilized phases is important, and engineering the HZO bottom interface on just a few monolayers of LSMO allows for the stabilization of the orthorhombic phase. Additionally, reducing the La content in the manganite leads to a severe reduction in the amount of orthorhombic phase and ferroelectric polarization in the HZO film.
JOURNAL OF MATERIALS CHEMISTRY C
(2021)
